Chapter 15 & 16

Homework Answers

Chapter 15

Multiple Choice
6. d
10. c
13. a
18. a
24. a

Problems
4. a) either charges must be zero or the distance becomes infinite
b) As r decreases the magnitude of F increases
c)
d) b
7.
15. Zero
21. 0.58 N positive x direction
24. 2.0 m for the +4.0 nC charge
27. 8.3 N at 49°
35.
40. 2.00 N/C south
42.
46. a)
b) right
c)
d) left
e)
f) right
48. 11 N/C in the positive x direction
52. 89.9 N/C at 179.857°
55.
57.
61. a) negative
b) Tension, electrostatic, gravitational
c)
d)
e)
f)
g)
63. a) upward
b) positive
c) upward electrostatic and downward gravitational
d)
e)
f)
71. 4.4 nC

Chapter 16

Multiple Choice
9. c
12. c
17. d
20. c

Problems
1. a) 6.0 V
b) increases
c)
d)
e) external force
6. 4.50µ J
13.±0.100 V
19. (a) 258 µN
(b) 38.7 µJ
(c) 38.7 µJ
(d) 1.94 V
(e) 98 V
27. zero
28. 8.99 km
35.
43. 539 V
48. (a)
(b)
(c) 0
(d) 0
52. 6.47 kV
59. (a) 0.050 m
(b) -45.0 kV
(c) Same
(d)
(e)
63. 0.15 nC
67. 90 mm
72.
77. (a) 12.0 V
(b)
(c)
(d) 1.20 V
79.
89. 2.0 nF
90. 1.0 µF
91. 3.0 µF
97. 10 pF
101. (a) parallel
(b) 12.0 µF
(c) 24.0 V
(d) 288 µC
(e) 96 µC
107. 13.0 µF
109.
115. 1.44 mJ
121.
124. 480 µJ